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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0890e615e5f667809fb103661f9c114ebd9daeeef8b68c8c1c05ad2c7a2fb1' 
  AND token = 'wlGK9LPwX52WNneMXCn2MHXhQTNr/A8MPcyT8Vmf4i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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