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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c76e5127c2db4dec007ec1b4cc15d924e2f5cbdc6507110e7ce812e281be6c3' 
  AND token = '7MyM5U2A0eyAaotP9Q59XafuX8WOqkW5vrc8m0QqO88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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