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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f5491e53f64b437c33d7f9c03d7b6c34734c079cabf6707a1edc8cbf54ae5ea' 
  AND token = 'Tn+NF76nbu3I0Wt4a6EsOxQfozCh25mtMTy8TdLke1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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