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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5564da3b465688b8b446339a72df754390fda19d73614e5db7aa687be8ae3df' 
  AND token = 'U47Bq2MCb3DsCve79Vd6nbkg4rf9V1IpAB/T3N7irgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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