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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd822ba2f06788cfe96f55d7accb3d6a565d6d6a2285f96e70385642a5167ceee' 
  AND token = 'e8kNEqtenoVv1iMObtD2Fm7FnHYLRZpZDi7TmoNoY5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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