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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f2136becd6b6d1e42d10d48a7312cf5aa0cb0e04be48a0693d5a6b4d89235a8' 
  AND token = '5zPn9S/MKsg8t4QbxhStixMtACEKI3bZQEmsAg79CFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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