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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb31ec93d1d2a2ba6c821cefa82db4dc54c81f4dd0cb082f2e50176e8aab85a9' 
  AND token = 'd0+z+MALKV26YzEcNzgxzoWYLNCUxYuCuRLLv/kqaJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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