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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '719c0b5835d061c4f531d8af4103e0cc86847ffcba8b6b8c58d11237ad6f98cc' 
  AND token = 'rJxSQPhEgaJecbnGPuUKeSGZV6eBuZmA0TME8HNnfVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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