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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04b7982915d597378e93178dbf3ec651f63fa6b39b0106dd8063dfd1e5ca7c90' 
  AND token = '9gICYCm076mOnR73dbI2n9hZHYdR5oryQTz5OEpQR+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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