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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd041ef8932dd7b80da181d592766514d550d77611c4aad84f24e44cb2f159c33' 
  AND token = 'wpwpA0t+8i99pkmMqsrk5QbjjgXREAfb2sgvAbQG1/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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