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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bfadeac3d407dfc3c23d2fe963535f712daa39d1d2d7793b549060e6f6b8eda' 
  AND token = 'tKDC/JMtuBFTHN/48zs3GoqaxVlib69Wkg0cmur/ofA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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