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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2fc9c438188ca6eae529169e1bcfac85ec56502347884ad06bb26f3ce5528eb' 
  AND token = 'KOaEI+EEy/xeboc5gA4G4JpEKHQ+VP4IIDPzknxjpZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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