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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e914791c6c66a2e0eaecd48c294253e2c48fc584d9eed0e5bb27ca85ecdd8c1' 
  AND token = 'vqtFPwMEEfE0v5QpxD4T8lW6VjJkTne0leM0q8MdPtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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