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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '676a9f33be19356986e3773609c68e1ca907e370f118757b25cfddf94e552ca1' 
  AND token = '9C1emIcNN7fzUCzFfavuHxRyw9JeYqJpxxZBmmr4ip8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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