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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a42919bc3ff5e3f697975176d4fd292eef8f76a98083a77c7b295fe6c2e59e66' 
  AND token = '6G4CmIGRW/+Jamh1owwrEPiZp/Av2Hp1d27k8N7/pdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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