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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '303e8bda7afedbe4b764a3c74c7a0779c9a136298dfd4101769672926ccd76d9' 
  AND token = 'FL7J0kHjgoIQ+sfzgoCh8K0/eOm19EMm4ur40qeuRss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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