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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09248185617b57db1a4c1357da4684cb30d82992c2906deea3a5a458a70fe7a' 
  AND token = '9XKwQ5R5hm5eK9qb5ChrQrR0VgTYbjrThVD6Xc7Yft8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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