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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37723d5a4e5b05b6dc8c5d9d62f394be19afb4877dbe3c1bff59d8c14ad119ce' 
  AND token = 'h3X/aLdvbKvVgt28XXSjCcYONvnH7Gpeh3ObwNnNOuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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