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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f0e3ef88a7aee3dcef14c5ad892dfe35d08eed7b5e3f88e5a4200333abfdc9' 
  AND token = '+g6K1jxXATe87Gdf48jTHTXWsDeHEE0qDd6WnMMKwLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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