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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a214c3a0602491d81b71f10d7f07d96bc23773bed95fb0a326b0e7f09367385' 
  AND token = '6ENj/p/MGUA3jqZ2VRJK7RbKD8DTL2AVO0hoOD/CqkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}