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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb7f37de2daea29a7f5128288e6dc57940b68b66010c247ba6d67d80e733f9b8' 
  AND token = 'r9S2x3ViPCc7+vzrXhSYGeAleK1sayp24satbbn8T+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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