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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07c5804e74712b1316faebd57fa0366a430ccae9431e7ce04b78791d2e45f21b' 
  AND token = 'G2C4c/N1FHxJYzTS2i4CcngotQbKdNzWqddE8dbhVdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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