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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd202497d74c9c55beb1f0baa8d2e1296e81bbebe7601661c1910bb228b481889' 
  AND token = 'pwNPlPSc2iCeYd3z5yH8UOD+42N06my15488+Px7YMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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