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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01aac83a3eddece8235cb844e12db23d8b821227bcaf6b2d194e59d006361a31' 
  AND token = '00AED+Tpb1H2Sl09CxNH31QbJoU9XfCpuDRU5DmdIlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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