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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0fb1460b8b51da4f3388365e4e7243944d14117b6117214726fa650dbc54a60' 
  AND token = 'unXtu9DZgGmrzeyN9qO6miTbCrhk9ZK/c5ME1iq+P4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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