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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac9abdf10d0cc8e753c0d6fb70ecbc0ff74eda0b2e220fa765052c3e3fb66175' 
  AND token = '8ut6S37TWUOZlQE9fZcwvKP+SigU1gn/s6tqyaH06JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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