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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9156af18f0071ba51b394da701c1fbf244f78cf294d3bf8b4814a8738350b9b4' 
  AND token = 'Z4i29uMRIKluNwbAf4pJ8GYNNeoOtY6d3VJsjUWCjuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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