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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd61d9ceabcd80fadb2daf3792fe905b0d60d61be05f8860d4584b4b6fdba70a7' 
  AND token = 'IA8bqzifToxz5/kDSYqPy85ZF9mDfd6WeFmUAKS4/Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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