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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5fe0ffeea54b6e66c0e26b644904ddf01ac4f0e00df073cc2d70d9ff3df8070' 
  AND token = '7gMhJRPt/74FLLYrMjSXCDdN5LcmU4IL6pCV5PGt+pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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