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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '935cdc455b852b1e97f9f650d7e0988670af3dead0a6c2bc1f99c4c17eb67386' 
  AND token = 'mmkG9mFtWTvAsK2Xg46gEW5W2zkSfxvLbxiM6zcp5kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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