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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8c5bf58d39f56df2576877a43c0fd0e72f881c895ed4a5435b01bd4b609313' 
  AND token = 'SbMoD8mdWZNec3mdB7lO5SeBaq9dd7JLwHDkTx+YaRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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