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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51efceba0592d94c1acc16488878c4660f76c19169c32ab854445e4c636ce335' 
  AND token = 'UqMivsanfnmxOm1W+Qnne7QJJAJgoGSgChrG9jo25ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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