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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6363043ed7aca882079ce0b0eb94890df85ef491a2b5028f9d42221a77d2e5b3' 
  AND token = 'tydyakYJ/qk8q/Xqx6edEiAUS4Fyhw20kL9anEB8wYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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