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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3df1c936b8fdb576720cd84e10baf48a6aed04c3c4e3ffc112d189a5e73b8ce' 
  AND token = 'V/LTW6+gkx/Yo22E5KAfq8CyiqqGO4TMP/pdysEn3pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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