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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58f79dac7102e56aa76ea444de47768e9bb42e70e639a1082edbea890350af25' 
  AND token = 'Jbq5MquDALGIdYsKjXi+JO+y7lpHo5p0EETmP25OM60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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