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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cda53474716e3c5365e5fdd282d76729e944c7638d86744ef3ae5fac9827f017' 
  AND token = 'jk/wm2LStuYuSgOCx7yBBolEf0lhyu1T22c4s2QzXBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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