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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3030c096e5af6f7e24abf368672989a6c454256ffb885a1f36cfbc388d980a5a' 
  AND token = 'LSF8ey8zLpZuzxrwt6ZoOctGwJ7VaV6vchCuKNQcYus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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