SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c46d9299330f8b711fb5c524f9287dc47f219d7a05223c90798f8c7d094358c' 
  AND token = 've3s4RbohhkaKok2ahRj+X3GQgBWJ3qPi2mrnzVNLmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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