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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e5e9b713da92f2282e2cbabb69b892cf5c39b4ad23579ab83891ec105188cf1' 
  AND token = '4lBH8O5FztKaW7z4Puaq65F/R7JUulWlTAWagKesP3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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