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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa26f8e7e41eb5b2136a22036f2be645eeee5040d281db7564f0882c8a6349e7' 
  AND token = 'XZLa5jBHLbOEZttvhW2HvYGZ213gjcZX9/hYnI2QMlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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