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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7971e76cf996c308e068975541d43b65c31117a543d31d0e08f3e8c489d33de7' 
  AND token = 'UVuEdoCRdmkx+C3aaO439QSAynww65Jzq7+MhYA7Wk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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