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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d711dbab066cbfa012cba9dade3b35a2beaf545e07d3e4a31d9f6af712bc3e2' 
  AND token = 'c8GFOzX8hkpku2r7fkst8q/xgU2PXfWcXA1+N7Ksgk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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