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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f1841630c0f1fa0475905c015e67f173522844130feffbdd8090b5a275d1150' 
  AND token = 'sa+qYx+0Vp6Vp5xrFtstRX98zrHvpfWyCf+JwxFdeaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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