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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6df86004ff8e2b80bffefc1ee11c57bc5019450a3d3f4333c68af6126a3858b' 
  AND token = 'Qve07GZLP42aCTOcr+vqIL8n4RzB1LEfduQf4z5qrMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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