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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd734189eb8182ed9755595cc1178f30f92fc2e5c40a0c6f5f192e79f7831ec1b' 
  AND token = 'EJcCY4Dhkug/mKi1fbflkgbxIOD0V299i9Q0QUdhAdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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