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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f5b4a5f4431b9577e61223356fdab45d3131abdc733e024ce310e43b28ed67' 
  AND token = '6g5+kgRpmYIgTg7pl4UhTChbEPKiZAraioNHE1he6Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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