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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8065d75abc92750316836176f98a55027e372d41006d5c71ca8fbe9d7ba83b83' 
  AND token = 'elGgdNFO2D6/mhz0ejnuK9YSbPykN+lNAQn6jLB01Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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