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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02e799e0436451052c1e0c30dd7c8dcba21039b107f24976d18c5ed769da5c7' 
  AND token = 'Ltc/Yi1xtDegJQXSJDYu2i7CrQexhBJi4U6Ehgjb2Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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