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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4339a8041bad26d4f5be27c6c0b522927b33fc4b35c1136234ae0a105b9e742' 
  AND token = 'AfdUnPOq3NJtZiTMCjqiemPaatwl4JyK+si7+FMQVuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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