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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c27ae34febf8f883141db5322b88e85ebe8ec6b6cb08525a77093e5c6f8622b' 
  AND token = 'iVmT+PRGyIF66bhPj2BpUiC4aUX41amRFX6c6Vq74Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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