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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c36c6ab104c25fe24ffd63a1c71de618c53dc678b7aa3f26fa958ff8814ea28' 
  AND token = 't7ve525PW1UjvdPrJ3Q6EP8wmiln/w0AmaKw4TC1TGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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