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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ac495f1caa3d85d1104dbb9f174d0a545384edd799bc009eb0cb19482fd0c9' 
  AND token = '7io4l2JTfKl4KSF9+gYEzxWKi0Gkdfqe+oNttWsrQNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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