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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39a1f65efb62e7b47b86bf3530296d90f6a752f7793b5d6458e2fc58829ebcd8' 
  AND token = 'HpbYRnxnCU0e2rY4x6PggjuJBu7a64xU4UaZluACzD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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