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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9844ad1f992e83158ce696a71104f0be2e659a2359cd0ab2b2a43e935947ddb8' 
  AND token = 'vZUT23xmpLRb7lIY3alhcAa/oG1Zayb9H33okKLbbm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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