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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c67129c623a4334e3e45a48978c47151a140cfcbf07c2f6142239044d9ab91' 
  AND token = 'GUxGQa9hjSjttYLz/QEvBf/IQ20ICh1a4F9wL7G4I8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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