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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e476af1553d97a76ab9d5cb55bb0d093faeccdc7a57b51f4dae7902ea4b5894' 
  AND token = 'jGr/MMBGbaY0AWOvwTHC/dLamUs9/nXFY5Yg3NtlPpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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